Zara Phillips, daughter of Princess Anne, gave birth to her first child last week at Gloucestershire Royal Hospital. Phillips does not hold a royal title after her mother decided not to pass her status to her children.

Phillips has become one of the country's best equestrian riders and helped lead team Britain to the silver medal, behind Germany, in the 2012 London Olympics in the equestrian event. She also advanced to the finals in the individual show jumping competition,according to CBS.

CBS noted that the Olympics event combines the discipline of dressage with the endurance of cross country riding with show jumping skills.

Phillips is planning to compete in the 2016 Olympics in Brazil.

Tindall was one of England best rugby players and helped lead the country to the 2003 World Cup, beating out Australia. The competition was where Tindall and Phillips met.

The Bath Chronicle reportedthat English bookies had been predicting more traditional name for the new royal baby, including Charlotte, Victoria, Anne and Elizabeth. Bookmakers William Hill said Mia entered the betting yesterday afternoon, with 16-1 odds.

"It looks like a few people managed to get Mia correct and we have now lost for the second time running," William Hill spokesman Rupert Adams said. "We might have to close that betting early for the next royal baby – be it William or Harry."

The couple married in July 2011in Edinburgh, which was attended by the Queen Elizabeth and senior royals.